How to Test Corrosion Resistance with a Salt Spray Test Chamber

The salt spray test chamber is primarily used to evaluate the corrosion resistance of test samples. It is widely applied in industries such as electrical engineering, digital accessories, plastic products, and aerospace manufacturing to assess the corrosion resistance of products and simulate their performance under extreme environmental conditions. The main purpose is to determine the corrosion resistance performance of various samples.

The basic working principle of this equipment is relatively simple. It involves spraying a corrosive mist onto the test samples and measuring the time until corrosion begins to appear. The longer the duration before corrosion occurs, the better the corrosion resistance of the sample.

The corrosive solution typically used for testing is a 5% sodium chloride (NaCl) solution. Alternatively, 0.26 grams of copper chloride (CuCl₂) per liter can be added to the NaCl solution to create a more aggressive salt spray test solution. Additionally, the salt spray test chamber allows independent control of the salt spray settling rate and spray volume, ensuring stable and balanced test conditions. It is easy to operate and provides a highly stable testing environment, making it commonly used to evaluate the corrosion resistance of daily necessities and industrial products.

Here’s an overview of the operation process:

Power Connection: Connect the main power supply of the equipment and the air compressor, then attach the air pressure hose.
Water Filling: Add purified water to the chamber and the rear water inlet until the low-water-level indicator light on the control panel turns off. Otherwise, the equipment will not function properly.
Sealing & Humidity Control:
Fill the barrier water tank to the designated level to prevent salt spray leakage.
Add water to the wet bulb cup and cover the wet bulb thermometer with gauze, ensuring the gauze extends into the wet bulb cup.
Salt Solution Preparation: Pour the test salt solution into the supply bottle, which will automatically fill the spray tower in the test chamber, allowing the solution to flow into the salt spray nozzle.
Post-Test Procedures:
After completing the salt spray test, rinse the sample surface gently with running water to remove salt deposits, then soak it in purified water. The cleaning temperature should not exceed 35°C. Afterward, let the sample recover in a standard indoor atmosphere for 2 hours.

Evaluation Criteria:

Qualified products should show no corrosion, blistering, cracking, or rust.
Defective products will exhibit one or more of these issues.
This method ensures accurate and reliable corrosion resistance testing for quality control and product validation.